Vibration damping device for steel hollow floor slab and steel hollow floor slab

Abstract

The invention provides a damping device for a steel hollow floor slab and the steel hollow floor slab, and relates to the technical field of floor slab damping, the damping device comprises a prestressed inhaul cable, a stiffening beam, a connecting short beam and a first friction damper; the stiffening beam is arranged at the bottom of the floor slab and used for supporting the floor slab and transmitting vertical vibration of the floor slab; the two ends of the stiffening beam are connected with the two connecting short beams correspondingly, and the stiffening beam is connected with the main beams on the two sides through the connecting short beams. One end of the connecting short beam is connected with the main beam, and the other end is connected with the end part of the stiffening beam; the upper surface of the connecting short beam is connected with the lower surface of the floor; the two first friction dampers are connected between the two ends of the stiffening beam and the two connecting short beams correspondingly and used for dissipating floor vibration energy. The two ends of the prestress inhaul cable are connected to the main beams on the two sides respectively and used for vibration reduction of the floor slab. The prestressed inhaul cables and the stiffening beams are arranged in parallel, and the prestressed inhaul cables are arranged on the two sides of the stiffening beams. Resonance of the floor slab under the action of pedestrian load is reduced, and living comfort and safety are improved.

Description

Technical Field

[0001] This invention relates to the field of floor slab vibration reduction technology, and in particular to a vibration reduction device for hollow steel floor slabs and the hollow steel floor slab itself. Background Art

[0002] Currently, hollow steel core slabs are widely used in prefabricated buildings due to their advantages such as light weight, high strength, and fast on-site assembly. In prefabricated building construction, construction workers can pre-assemble the floor slabs and surface layers in the factory, eliminating the need for on-site pouring and saving time required for on-site processing of prefabricated components, thus simplifying on-site operations. Hollow steel core slabs offer significant advantages in the transportation and on-site assembly of prefabricated buildings due to their light weight, high strength, and fast on-site assembly.

[0003] Although steel hollow core slabs are widely used in prefabricated buildings due to their advantages such as light weight, high strength, and fast on-site assembly, their stiffness and damping are relatively small. Therefore, steel hollow core slabs are prone to resonance under pedestrian loads, which affects the living comfort and safety of prefabricated buildings. Summary of the Invention

[0004] The purpose of this invention is to provide a vibration damping device for hollow steel floor slabs and a hollow steel floor slab, so as to solve at least one of the above-mentioned technical problems existing in the prior art.

[0005] In a first aspect, to solve the above-mentioned technical problems, the present invention provides a vibration damping device for steel hollow floor slabs, comprising: prestressed cables, stiffening beams, two connecting short beams and two first friction dampers; The stiffening beam is installed at the bottom of the floor slab to support the floor slab, transmit the vertical vibration of the floor slab, improve the overall stiffness and natural frequency of the floor slab, and reduce the vibration response of the floor slab when people walk on it. The stiffening beam is connected to two connecting short beams at both ends, and is connected to the main beams on both sides for supporting the floor slab through the connecting short beams; One end of the connecting short beam is connected to the main beam, and the other end is connected to the end of the stiffening beam; the upper surface of the connecting short beam is connected to the lower surface of the floor slab. The two first friction dampers are respectively connected between the two ends of the stiffening beam and the two connecting short beams for dissipating floor vibration energy; The two ends of the prestressed cable are respectively connected to the main beams on both sides for vibration reduction of the floor slab; The prestressed cables are arranged parallel to the stiffening beam, and the prestressed cables are provided on both sides of the stiffening beam.

[0006] When a pedestrian load acts on the floor slab, the floor slab vibrates vertically, causing the stiffening beam to vibrate vertically. During the vibration, an angle is generated between the stiffening beam and the connecting short beam. The first friction damper plays a damping role, converting the vibration energy into heat energy for dissipation. At the same time, the prestressed cable provides a restoring torque opposite to the rotation direction of the first friction damper, reducing the floor slab amplitude.

[0007] This application involves installing a stiffening beam, a connecting short beam, and prestressed cables below the floor slab. A first friction damper is installed between the stiffening beam and the connecting short beam. The first friction damper converts vibration energy into heat energy, accelerating the dissipation of floor slab vibration energy. At the same time, the prestressed cables provide a restoring torque opposite to the rotation direction of the first friction damper, reducing the amplitude of the floor slab under pedestrian loads and improving living comfort and safety.

[0008] Furthermore, the stiffening beam is composed of several sub-stiffening beams, and a second friction damper is connected between two adjacent sub-stiffening beams for dissipating floor vibration energy; When a pedestrian load acts on the floor slab, the floor slab vibrates vertically, causing the sub-stiffening beams to vibrate vertically. During the vibration, an angle is generated between adjacent sub-stiffening beams. The second friction damper plays a damping role, converting vibration energy into heat energy for dissipation. At the same time, the prestressed cables provide a restoring torque opposite to the rotation direction of the second friction damper, reducing the floor slab amplitude.

[0009] Furthermore, the upper surface of the stiffening beam is connected to the lower surface of the floor slab by bolts or welding.

[0010] Furthermore, both the first friction damper and the second friction damper include: a first lug, a second lug, two friction plates, and several preload bolts; The first ear plate is a double ear plate, the second ear plate is a single ear plate, and the second ear plate is disposed between the two ear plates of the first ear plate; The two friction plates are respectively disposed between the second ear plate and the two ear plates of the first ear plate, and are attached to the first ear plate and the second ear plate by a number of pre-tightening bolts. They are used to rub against the first ear plate and the second ear plate when the floor slab vibrates vertically, so as to convert the vibration energy into heat energy and accelerate the dissipation of the vibration energy of the floor slab. The first lug and the second lug of the first friction damper are respectively connected to the ends of the connecting short beam and the stiffening beam; The first and second lugs of the second friction damper are respectively connected to the ends of the two adjacent sub-stiffening beams.

[0011] Furthermore, end plates are provided at the ends of the connecting short beam and the stiffening beam, and the first lug plate and the second lug plate of the first friction damper are connected to the end plate by welding, and are connected to the ends of the connecting short beam and the stiffening beam through the end plate; The end plate is also disposed at the ends of two adjacent sub-stiffening beams, and the first and second lugs of the second friction damper are connected to the ends of the two adjacent sub-stiffening beams through the end plate.

[0012] Furthermore, the ends of the prestressed cables are connected to the main beam by anchoring.

[0013] Preferably, the anchoring node of the prestressed cable includes: a third ear plate and a first pin. The third ear plate is a double ear plate, and the first pin is passed through the two ear plates of the third ear plate. The end of the prestressed cable is wound around the first pin and fixed by a buckle. The third ear plate is disposed on the main beam, and the end of the prestressed cable is connected to the main beam through the third ear plate.

[0014] Furthermore, the prestressed cable is provided with a support, the upper end of which is fixed to the bottom of the floor slab, and the lower end of which abuts against the prestressed cable for the bending of the prestressed cable. After prestress is applied to the prestressed cable, the prestressed cable abuts against the lower end of the support, forcing the prestressed cable to bend at a certain angle.

[0015] Furthermore, the support includes: a fourth ear plate, a fifth ear plate, a second pin, and a pad; The fourth ear plate is a double ear plate, and the fifth ear plate is a single ear plate; The fourth ear plate is fixed to the bottom of the floor slab; One end of the fifth ear plate is connected between the two ear plates of the fourth ear plate via the second pin. The other end of the fifth ear plate is connected to the pad plate, and the prestressed cable is connected to the side of the pad plate opposite to the fifth ear plate by U-bolts.

[0016] Furthermore, the prestressed cable is provided with an adjuster for adjusting the prestress applied to the prestressed cable.

[0017] Secondly, based on the same inventive concept, the present invention provides a steel hollow floor slab including the vibration damping device for steel hollow floor slabs as described above, and further including: floor slab and four main beams; The floor slab is installed on the four main beams; The four main beams are arranged on the four sides of the floor slab to support the floor slab; The bottom of the floor slab is provided with several prestressed cables and several stiffening beams arranged parallel to each other along the width direction; The stiffening beam is connected to the connecting short beam at both ends by two first friction dampers, and then connected to the main beams on both sides by the two connecting short beams. Several stiffening beams and several prestressed cables are alternately arranged for vibration reduction of the floor slab; Alternatively, several prestressed cables may be arranged intersectingly along the width and length directions at the bottom of the floor slab to reduce vibration.

[0018] By adopting the above technical solution, the present invention has the following beneficial effects: The present invention provides a vibration reduction device for hollow steel floor slabs and a hollow steel floor slab. The device converts vibration energy into heat energy through a first friction damper and a second friction damper, thereby accelerating the dissipation of vibration energy of the floor slab. At the same time, the device provides a restoring torque with the opposite rotation direction to the first and second friction dampers through prestressed cables, thereby reducing the amplitude of the floor slab under pedestrian loads and improving living comfort and safety. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 A cross-sectional view of a vibration damping device for steel hollow floor slabs provided in an embodiment of the present invention; Figure 2 for Figure 1 Top view of the first and second friction dampers shown; Figure 3 for Figure 1 The diagram shows the structure of the prestressed cable. Figure 4 for Figure 3 The diagram shown illustrates the structure of a prestressed cable with a support. Figure 5 for Figure 3 The diagram shows the structural state of the prestressed cable when two supports are installed. Figure 6 for Figure 3 A magnified view of the anchoring node shown; Figure 7 for Figure 6 The right view of the anchoring node shown; Figure 8 for Figure 3 The front view of the support shown; Figure 9 for Figure 8 A top view of the support shown; Figure 10 for Figure 8 Left view of the support shown; Figure 11 A plan view of the steel hollow floor slab provided in an embodiment of the present invention; Figure 12 A plan view of a steel hollow floor slab provided in another embodiment of the present invention; Figure 13 A plan view of a steel hollow floor slab provided in another embodiment of the present invention; Figure 14 for Figure 13 The diagram shows the structure of the prestressed cable. Figure 15 for Figure 13 The image shows a partial enlarged view of the prestressed cable.

[0021] Figure label: 11-Stiffening beam; 111-Sub-stiffening beam; 12-Connecting short beam; 13a-First friction damper; 13b-Second friction damper; 131-First lug; 132-Second lug; 133-Friction pad; 134-Pre-tightening bolt; 14-Prestressed cable; 141-Adjuster; 15-End plate; 16-Anchoring node; 161-Third lug; 162-First pin; 163-Snap fastener; 17-Support; 171-Fourth lug; 172-Fifth lug; 173-Second pin; 174-Pad; 175-U-bolt; 2-Floor slab; 3-Main beam. Detailed Implementation

[0022] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0025] The present invention will be further explained below with reference to specific embodiments.

[0026] It should also be noted that the specific embodiments or implementation methods described below are a series of optimized settings listed by the present invention to further explain the specific content of the invention, and these settings can be combined or used in conjunction with each other.

[0027] Example 1 like Figure 1-10 As shown, this embodiment provides a vibration damping device for a steel hollow floor slab, comprising: a prestressed cable 14, a stiffening beam 11, two connecting short beams 12, and two first friction dampers 13a; the stiffening beam 11 is disposed at the bottom of the floor slab 2, used to support the floor slab 2, transmit the vertical vibration of the floor slab 2, improve the overall stiffness and natural frequency of the floor slab 2, and reduce the pedestrian vibration response of the floor slab 2; both ends of the stiffening beam 11 are respectively connected to the two connecting short beams 12, and are connected to the main beams 3 on both sides for supporting the floor slab 2 through the connecting short beams 12; the connecting short beams 12... One end is connected to the web of the main beam 3, and the other end is connected to the end of the stiffening beam 11; the upper surface of the connecting short beam 12 is connected to the lower surface of the floor slab 2; two first friction dampers 13a are respectively connected between the two ends of the stiffening beam 11 and the two connecting short beams 12 for dissipating the vibration energy of the floor slab 2; the two ends of the prestressed cable 14 are respectively connected to the web of the main beam 3 on both sides for vibration reduction of the floor slab 2; the prestressed cable 14 is arranged parallel to the stiffening beam 11, and the prestressed cable 14 is provided on both sides of the stiffening beam 11.

[0028] When a pedestrian load acts on the floor slab 2, the floor slab 2 vibrates vertically, causing the stiffening beam 11 to vibrate vertically. During the vibration, the stiffening beam 11 and the connecting short beam 12 generate an angle. The first friction damper 13a plays a damping role, converting the vibration energy into heat energy for dissipation. At the same time, the prestressed cable 14 provides a restoring torque opposite to the rotation direction of the first friction damper 13a, reducing the amplitude of the floor slab 2.

[0029] This application provides a stiffening beam 11, a connecting short beam 12, and a prestressed cable 14 below the floor slab 2. A first friction damper 13a is installed between the stiffening beam 11 and the connecting short beam 12. The first friction damper 13a converts vibration energy into heat energy, accelerating the dissipation of vibration energy in the floor slab 2. At the same time, the prestressed cable 14 provides a restoring torque opposite to the rotation direction of the first friction damper 13a, reducing the amplitude of the floor slab 2 under pedestrian loads and improving living comfort and safety.

[0030] Reference Figure 1 As shown, based on the above technical solution, and further preferably, the stiffening beam 11 is composed of two sub-stiffening beams 111, and a second friction damper 13b is connected between two adjacent sub-stiffening beams 111 for dissipating the vibration energy of the floor slab 2. When a pedestrian load acts on the floor slab 2, the floor slab 2 vibrates vertically, causing the sub-stiffening beam 111 to vibrate vertically. During the vibration, an angle is generated between adjacent sub-stiffening beams 111. The second friction damper 13b plays a damping role, converting vibration energy into heat energy for dissipation. At the same time, the prestressed cable 14 provides a restoring torque opposite to the rotation direction of the second friction damper 13b, reducing the amplitude of the floor slab 2.

[0031] More preferably, the upper surface of the stiffening beam 11 is connected to the lower surface of the floor slab 2 by bolts or welding.

[0032] Reference Figure 2As shown, in this embodiment, both the first friction damper 13a and the second friction damper 13b include: a first ear plate 131, a second ear plate 132, two friction pads 133, and several pre-tightening bolts 134; the first ear plate 131 is a double ear plate, and the second ear plate 132 is a single ear plate, with the second ear plate 132 disposed between the two ear plates of the first ear plate 131; the two friction pads 133 are respectively disposed between the second ear plate 132 and the two ear plates of the first ear plate 131, and are attached to the first ear plate 131 and the second ear plate 132 by several pre-tightening bolts 134, for use in the vertical vibration of the floor slab 2, the friction pads 133 and the first ear plate 132 are connected to the first ear plate 131 and the second ear plate 132 by the friction pads 134. Friction between the first ear plate 131 and the second ear plate 132 converts vibration energy into heat energy, thereby accelerating the dissipation of vibration energy of the floor slab 2. By setting a preload applied to the preload bolt 134, when the vibration stops, the two friction plates 133 are in contact with the first ear plate 131 and the second ear plate 132, and the connecting short beam 12 and the stiffening beam 11 remain in a horizontal state. The first ear plate 131 and the second ear plate 132 of the first friction damper 13a are respectively connected to the ends of the connecting short beam 12 and the stiffening beam 11. The first ear plate 131 and the second ear plate 132 of the second friction damper 13b are respectively connected to the ends of the two adjacent sub-stiffening beams 111.

[0033] More preferably, the ends of the connecting short beam 12 and the stiffening beam 11 are provided with end plates 15, the first lug 131 and the second lug 132 of the first friction damper 13a are connected to the end plate 15 by welding, and the end plate 15 is connected to the ends of the connecting short beam 12 and the stiffening beam 11; the end plate 15 is also provided at the ends of two adjacent sub-stiffening beams 111, and the first lug 131 and the second lug 132 of the second friction damper 13b are connected to the ends of the two adjacent sub-stiffening beams 111 through the end plate 15.

[0034] Reference Figure 3 As shown, the end of the prestressed cable 14 is further connected to the main beam 3 by anchoring.

[0035] Reference Figure 6 , Figure 7 As shown, in this embodiment, the anchoring node 16 of the prestressed cable 14 includes: a third ear plate 161 and a first pin 162; the third ear plate 161 is a double ear plate, and the first pin 162 is passed through the two ear plates of the third ear plate 161. The end of the prestressed cable 14 is wound around the first pin 162 and fixed by a buckle 163; the third ear plate 161 is disposed on the main beam 3, and the end of the prestressed cable 14 is connected to the main beam 3 through the third ear plate 161.

[0036] Reference Figure 4 , Figure 5 As shown, more preferably, the prestressed cable 14 is provided with a support 17. The upper end of the support 17 is fixed to the bottom of the floor slab by welding, and the lower end of the support 17 abuts against the prestressed cable 14 for bending the prestressed cable 14. After prestress is applied to the prestressed cable 14, the prestressed cable 14 abuts against the lower end 14 of the support 17, forcing the prestressed cable 14 to bend at a certain angle.

[0037] Reference Figure 8 , Figure 9 and Figure 10 As shown, in this embodiment, the support 17 includes: a fourth ear plate 171, a fifth ear plate 172, a second pin 173, and a pad 174; the fourth ear plate 171 is a double ear plate, and the fifth ear plate 172 is a single ear plate; the fourth ear plate 171 is fixed to the bottom of the floor slab; one end of the fifth ear plate 172 is connected between the two ear plates of the fourth ear plate 171 through the second pin 173; the other end of the fifth ear plate 172 is connected to the pad 174, and the prestressed cable 14 is connected to the side of the pad 174 away from the fifth ear plate 172 by a U-bolt 175.

[0038] More preferably, the prestressed cable 14 is provided with an adjuster 141 for adjusting the prestress applied to the prestressed cable 14.

[0039] The present invention converts vibration energy into heat energy through the first friction damper 13a and the second friction damper 13b, thereby accelerating the dissipation of vibration energy of the floor slab 2. At the same time, the prestressed cable 14 provides a restoring torque that is opposite to the rotation direction of the first friction damper 13a and the second friction damper 13b, thereby reducing the amplitude of the floor slab 2 under pedestrian load and improving living comfort and safety.

[0040] Example 2 like Figure 11 As shown, this embodiment provides a hollow steel floor slab including the vibration damping device for hollow steel floor slabs as described above, comprising: a floor slab 2 and four main beams 3; the floor slab 2 is a one-way floor slab; the floor slab 2 is installed on the four main beams 3; the four main beams 3 are arranged on the four sides of the floor slab 2 for supporting the floor slab 2; a plurality of prestressed cables 14 are arranged parallel to each other along the width direction at the bottom of the floor slab 2 for vibration damping of the floor slab 2.

[0041] Example 3 This embodiment is basically the same as embodiment 2, except that: like Figure 12As shown, this embodiment provides a steel hollow floor slab including the vibration damping device for steel hollow floor slabs as described above. The bottom of the floor slab 2 is also provided with a plurality of stiffening beams 11 along the width direction. The two ends of the stiffening beams 11 are respectively connected to the connecting short beams 12 through two first friction dampers 13a, and then connected to the main beams 3 on both sides through the two connecting short beams 12. Several stiffening beams 11 and several prestressed cables 14 are arranged alternately for vibration reduction of the floor slab 2.

[0042] Example 4 This embodiment is basically the same as embodiment 2, except that: like Figure 13-15 As shown, this embodiment provides a steel hollow floor slab including the vibration damping device for steel hollow floor slabs as described above. The bottom of the floor slab 2 is provided with a plurality of prestressed cables 14 arranged intersectingly along the width and length directions for vibration damping of the floor slab 2.

[0043] Reference Figure 14 , Figure 15 As shown, in this embodiment, a plurality of prestressed cables 14 arranged parallel to the length of the floor slab 2 are positioned above a plurality of prestressed cables 14 arranged parallel to the width of the floor slab 2.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A vibration reduction device for a steel hollow floor, characterized in that: include: prestressed cables, a stiffening beam, two connecting short beams and two first friction dampers; The stiffening beam is arranged at the bottom of the floor slab to support the floor slab and transmit the vertical vibration of the floor slab; The two ends of the stiffening beam are respectively connected to the two connecting short beams, and are connected to the main beams on both sides for supporting the floor slab through the connecting short beams; One end of the connecting short beam is connected to the main beam, and the other end is connected to the end of the stiffening beam; the upper surface of the connecting short beam is connected to the lower surface of the floor slab; The two first friction dampers are respectively connected between the two ends of the stiffening beam and the two connecting short beams, and are used for dissipating the vibration energy of the floor slab; The two ends of the prestressed cable are respectively connected to the main beams on both sides for vibration reduction of the floor slab; The prestressed cables are arranged in parallel with the stiffening beams, and the prestressed cables are arranged on both sides of the stiffening beams.

2. The vibration reduction device for steel hollow-core floor slab according to claim 1, characterized in that: The stiffening beam is composed of a plurality of sub-stiffening beams, and a second friction damper is connected between two adjacent sub-stiffening beams to dissipate the vibration energy of the floor.

3. The vibration reduction device for steel hollow-core floor slab according to claim 1, characterized in that: The upper surface of the stiffening beam is connected to the lower surface of the floor slab by bolts or welding.

4. The vibration reduction device for steel hollow-core floor slab according to claim 2, characterized in that: The first friction damper and the second friction damper each include: a first ear plate, a second ear plate, two friction plates and a plurality of pre-tightening bolts; The first ear plate is a double-ear plate, the second ear plate is a single-ear plate, and the second ear plate is arranged between the two ear plates of the first ear plate; The two friction plates are respectively arranged between the second ear plate and the two ear plates of the first ear plate, and are fitted with the first ear plate and the second ear plate through a plurality of pre-tightening bolts, so as to dissipate the vibration energy of the floor plate through friction with the first ear plate and the second ear plate when the floor plate vibrates vertically; The first ear plate and the second ear plate of the first friction damper are respectively connected to the ends of the connecting short beam and the stiffening beam; The first ear plate and the second ear plate of the second friction damper are respectively connected to the ends of two adjacent sections of the sub-stiffening beams.

5. The vibration reduction device for steel hollow-core floor slab according to claim 4, characterized in that: End plates are provided at the ends of the connecting short beam and the stiffening beam, and the first ear plate and the second ear plate of the first friction damper are connected to the end plates by welding, and are connected to the ends of the connecting short beam and the stiffening beam through the end plates; The end plate is also arranged at the ends of two adjacent sections of the sub-stiffening beams, and the first ear plate and the second ear plate of the second friction damper are connected to the ends of the two adjacent sections of the sub-stiffening beams through the end plate.

6. The vibration reduction device for steel hollow-core floor slab according to claim 1, characterized in that: The ends of the prestressed cables are connected to the main beam by anchoring; The anchoring node of the prestressed cable includes: a third ear plate and a first pin shaft; The third ear plate is a double-ear plate, the two ear plates of the third ear plate are provided with the first pin shaft, and the end of the prestressed cable is wound around the first pin shaft and fixed by a buckle; The third ear plate is arranged on the main beam, and the end of the prestressed cable is connected to the main beam through the third ear plate.

7. The vibration reduction device for steel hollow-core floor slab according to claim 1, characterized in that: The prestressed cable is provided with a support, the upper end of the support is fixed to the bottom of the floor slab, and the lower end of the support is against the prestressed cable, which is used for the turning of the prestressed cable.

8. The vibration reduction device for steel hollow-core floor slab according to claim 7, characterized in that: The support comprises: a fourth ear plate, a fifth ear plate, a second pin shaft and a pad; The fourth ear plate is fixed to the bottom of the floor slab; One end of the fifth ear plate is connected to the fourth ear plate through the second pin shaft; The other end of the fifth ear plate is connected to the pad, and the prestressed cable is connected to the side of the pad away from the fifth ear plate through a U-bolt.

9. The vibration reduction device for steel hollow-core floor slab according to claim 1, characterized in that: The prestressed cable is provided with an adjuster for adjusting the prestress applied to the prestressed cable.

10. A steel hollow floor slab comprising the vibration reduction device for steel hollow floor slabs according to any one of claims 1 to 9, characterized in that: Also includes: floor slab and four main beams; The floor slab is installed on the four main beams; The four main beams are arranged on four sides of the floor slab to support the floor slab; A plurality of stiffening beams and a plurality of prestressed cables are arranged in parallel at the bottom of the floor slab; The two ends of the stiffening beam are respectively connected to the connecting short beams through two first friction dampers, and further connected to the main beams on both sides through the two connecting short beams; A plurality of the stiffening beams and a plurality of the prestressed cables are arranged alternately to reduce vibration of the floor slab; Alternatively, a plurality of prestressed cables are cross-arranged at the bottom of the floor slab to reduce vibrations through the prestressed cables.

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